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postgresql/src/backend/utils/adt/oracle_compat.c

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/*-------------------------------------------------------------------------
* oracle_compat.c
* Oracle compatible functions.
*
* Copyright (c) 1996-2023, PostgreSQL Global Development Group
*
* Author: Edmund Mergl <E.Mergl@bawue.de>
* Multibyte enhancement: Tatsuo Ishii <ishii@postgresql.org>
*
*
* IDENTIFICATION
* src/backend/utils/adt/oracle_compat.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "common/int.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/formatting.h"
#include "utils/memutils.h"
#include "varatt.h"
static text *dotrim(const char *string, int stringlen,
const char *set, int setlen,
bool doltrim, bool dortrim);
static bytea *dobyteatrim(bytea *string, bytea *set,
bool doltrim, bool dortrim);
/********************************************************************
*
* lower
*
* Syntax:
*
* text lower(text string)
*
* Purpose:
*
* Returns string, with all letters forced to lowercase.
*
********************************************************************/
Datum
lower(PG_FUNCTION_ARGS)
{
text *in_string = PG_GETARG_TEXT_PP(0);
char *out_string;
text *result;
out_string = str_tolower(VARDATA_ANY(in_string),
VARSIZE_ANY_EXHDR(in_string),
PG_GET_COLLATION());
result = cstring_to_text(out_string);
pfree(out_string);
PG_RETURN_TEXT_P(result);
}
/********************************************************************
*
* upper
*
* Syntax:
*
* text upper(text string)
*
* Purpose:
*
* Returns string, with all letters forced to uppercase.
*
********************************************************************/
Datum
upper(PG_FUNCTION_ARGS)
{
text *in_string = PG_GETARG_TEXT_PP(0);
char *out_string;
text *result;
out_string = str_toupper(VARDATA_ANY(in_string),
VARSIZE_ANY_EXHDR(in_string),
PG_GET_COLLATION());
result = cstring_to_text(out_string);
pfree(out_string);
PG_RETURN_TEXT_P(result);
}
/********************************************************************
*
* initcap
*
* Syntax:
*
* text initcap(text string)
*
* Purpose:
*
* Returns string, with first letter of each word in uppercase, all
* other letters in lowercase. A word is defined as a sequence of
* alphanumeric characters, delimited by non-alphanumeric
* characters.
*
********************************************************************/
Datum
initcap(PG_FUNCTION_ARGS)
{
text *in_string = PG_GETARG_TEXT_PP(0);
char *out_string;
text *result;
out_string = str_initcap(VARDATA_ANY(in_string),
VARSIZE_ANY_EXHDR(in_string),
PG_GET_COLLATION());
result = cstring_to_text(out_string);
pfree(out_string);
PG_RETURN_TEXT_P(result);
}
/********************************************************************
*
* lpad
*
* Syntax:
*
* text lpad(text string1, int4 len, text string2)
*
* Purpose:
*
* Returns string1, left-padded to length len with the sequence of
* characters in string2. If len is less than the length of string1,
* instead truncate (on the right) to len.
*
********************************************************************/
Datum
lpad(PG_FUNCTION_ARGS)
{
text *string1 = PG_GETARG_TEXT_PP(0);
int32 len = PG_GETARG_INT32(1);
text *string2 = PG_GETARG_TEXT_PP(2);
text *ret;
char *ptr1,
*ptr2,
*ptr2start,
*ptr2end,
*ptr_ret;
int m,
s1len,
s2len;
int bytelen;
/* Negative len is silently taken as zero */
if (len < 0)
len = 0;
s1len = VARSIZE_ANY_EXHDR(string1);
if (s1len < 0)
s1len = 0; /* shouldn't happen */
s2len = VARSIZE_ANY_EXHDR(string2);
if (s2len < 0)
s2len = 0; /* shouldn't happen */
s1len = pg_mbstrlen_with_len(VARDATA_ANY(string1), s1len);
if (s1len > len)
s1len = len; /* truncate string1 to len chars */
if (s2len <= 0)
len = s1len; /* nothing to pad with, so don't pad */
/* compute worst-case output length */
if (unlikely(pg_mul_s32_overflow(pg_database_encoding_max_length(), len,
&bytelen)) ||
unlikely(pg_add_s32_overflow(bytelen, VARHDRSZ, &bytelen)) ||
unlikely(!AllocSizeIsValid(bytelen)))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested length too large")));
ret = (text *) palloc(bytelen);
m = len - s1len;
ptr2 = ptr2start = VARDATA_ANY(string2);
ptr2end = ptr2 + s2len;
ptr_ret = VARDATA(ret);
while (m--)
{
int mlen = pg_mblen(ptr2);
memcpy(ptr_ret, ptr2, mlen);
ptr_ret += mlen;
ptr2 += mlen;
if (ptr2 == ptr2end) /* wrap around at end of s2 */
ptr2 = ptr2start;
}
ptr1 = VARDATA_ANY(string1);
while (s1len--)
{
int mlen = pg_mblen(ptr1);
memcpy(ptr_ret, ptr1, mlen);
ptr_ret += mlen;
ptr1 += mlen;
}
SET_VARSIZE(ret, ptr_ret - (char *) ret);
PG_RETURN_TEXT_P(ret);
}
/********************************************************************
*
* rpad
*
* Syntax:
*
* text rpad(text string1, int4 len, text string2)
*
* Purpose:
*
* Returns string1, right-padded to length len with the sequence of
* characters in string2. If len is less than the length of string1,
* instead truncate (on the right) to len.
*
********************************************************************/
Datum
rpad(PG_FUNCTION_ARGS)
{
text *string1 = PG_GETARG_TEXT_PP(0);
int32 len = PG_GETARG_INT32(1);
text *string2 = PG_GETARG_TEXT_PP(2);
text *ret;
char *ptr1,
*ptr2,
*ptr2start,
*ptr2end,
*ptr_ret;
int m,
s1len,
s2len;
int bytelen;
/* Negative len is silently taken as zero */
if (len < 0)
len = 0;
s1len = VARSIZE_ANY_EXHDR(string1);
if (s1len < 0)
s1len = 0; /* shouldn't happen */
s2len = VARSIZE_ANY_EXHDR(string2);
if (s2len < 0)
s2len = 0; /* shouldn't happen */
s1len = pg_mbstrlen_with_len(VARDATA_ANY(string1), s1len);
if (s1len > len)
s1len = len; /* truncate string1 to len chars */
if (s2len <= 0)
len = s1len; /* nothing to pad with, so don't pad */
/* compute worst-case output length */
if (unlikely(pg_mul_s32_overflow(pg_database_encoding_max_length(), len,
&bytelen)) ||
unlikely(pg_add_s32_overflow(bytelen, VARHDRSZ, &bytelen)) ||
unlikely(!AllocSizeIsValid(bytelen)))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested length too large")));
ret = (text *) palloc(bytelen);
m = len - s1len;
ptr1 = VARDATA_ANY(string1);
ptr_ret = VARDATA(ret);
while (s1len--)
{
int mlen = pg_mblen(ptr1);
memcpy(ptr_ret, ptr1, mlen);
ptr_ret += mlen;
ptr1 += mlen;
}
ptr2 = ptr2start = VARDATA_ANY(string2);
ptr2end = ptr2 + s2len;
while (m--)
{
int mlen = pg_mblen(ptr2);
memcpy(ptr_ret, ptr2, mlen);
ptr_ret += mlen;
ptr2 += mlen;
if (ptr2 == ptr2end) /* wrap around at end of s2 */
ptr2 = ptr2start;
}
SET_VARSIZE(ret, ptr_ret - (char *) ret);
PG_RETURN_TEXT_P(ret);
}
/********************************************************************
*
* btrim
*
* Syntax:
*
* text btrim(text string, text set)
*
* Purpose:
*
* Returns string with characters removed from the front and back
* up to the first character not in set.
*
********************************************************************/
Datum
btrim(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
text *set = PG_GETARG_TEXT_PP(1);
text *ret;
ret = dotrim(VARDATA_ANY(string), VARSIZE_ANY_EXHDR(string),
VARDATA_ANY(set), VARSIZE_ANY_EXHDR(set),
true, true);
PG_RETURN_TEXT_P(ret);
}
/********************************************************************
*
* btrim1 --- btrim with set fixed as ' '
*
********************************************************************/
Datum
btrim1(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
text *ret;
ret = dotrim(VARDATA_ANY(string), VARSIZE_ANY_EXHDR(string),
" ", 1,
true, true);
PG_RETURN_TEXT_P(ret);
}
/*
* Common implementation for btrim, ltrim, rtrim
*/
static text *
dotrim(const char *string, int stringlen,
const char *set, int setlen,
bool doltrim, bool dortrim)
{
int i;
/* Nothing to do if either string or set is empty */
if (stringlen > 0 && setlen > 0)
{
if (pg_database_encoding_max_length() > 1)
{
/*
* In the multibyte-encoding case, build arrays of pointers to
* character starts, so that we can avoid inefficient checks in
* the inner loops.
*/
const char **stringchars;
const char **setchars;
int *stringmblen;
int *setmblen;
int stringnchars;
int setnchars;
int resultndx;
int resultnchars;
const char *p;
int len;
int mblen;
const char *str_pos;
int str_len;
stringchars = (const char **) palloc(stringlen * sizeof(char *));
stringmblen = (int *) palloc(stringlen * sizeof(int));
stringnchars = 0;
p = string;
len = stringlen;
while (len > 0)
{
stringchars[stringnchars] = p;
stringmblen[stringnchars] = mblen = pg_mblen(p);
stringnchars++;
p += mblen;
len -= mblen;
}
setchars = (const char **) palloc(setlen * sizeof(char *));
setmblen = (int *) palloc(setlen * sizeof(int));
setnchars = 0;
p = set;
len = setlen;
while (len > 0)
{
setchars[setnchars] = p;
setmblen[setnchars] = mblen = pg_mblen(p);
setnchars++;
p += mblen;
len -= mblen;
}
resultndx = 0; /* index in stringchars[] */
resultnchars = stringnchars;
if (doltrim)
{
while (resultnchars > 0)
{
str_pos = stringchars[resultndx];
str_len = stringmblen[resultndx];
for (i = 0; i < setnchars; i++)
{
if (str_len == setmblen[i] &&
memcmp(str_pos, setchars[i], str_len) == 0)
break;
}
if (i >= setnchars)
break; /* no match here */
string += str_len;
stringlen -= str_len;
resultndx++;
resultnchars--;
}
}
if (dortrim)
{
while (resultnchars > 0)
{
str_pos = stringchars[resultndx + resultnchars - 1];
str_len = stringmblen[resultndx + resultnchars - 1];
for (i = 0; i < setnchars; i++)
{
if (str_len == setmblen[i] &&
memcmp(str_pos, setchars[i], str_len) == 0)
break;
}
if (i >= setnchars)
break; /* no match here */
stringlen -= str_len;
resultnchars--;
}
}
pfree(stringchars);
pfree(stringmblen);
pfree(setchars);
pfree(setmblen);
}
else
{
/*
* In the single-byte-encoding case, we don't need such overhead.
*/
if (doltrim)
{
while (stringlen > 0)
{
char str_ch = *string;
for (i = 0; i < setlen; i++)
{
if (str_ch == set[i])
break;
}
if (i >= setlen)
break; /* no match here */
string++;
stringlen--;
}
}
if (dortrim)
{
while (stringlen > 0)
{
char str_ch = string[stringlen - 1];
for (i = 0; i < setlen; i++)
{
if (str_ch == set[i])
break;
}
if (i >= setlen)
break; /* no match here */
stringlen--;
}
}
}
}
/* Return selected portion of string */
return cstring_to_text_with_len(string, stringlen);
}
/*
* Common implementation for bytea versions of btrim, ltrim, rtrim
*/
bytea *
dobyteatrim(bytea *string, bytea *set, bool doltrim, bool dortrim)
{
bytea *ret;
char *ptr,
*end,
*ptr2,
*ptr2start,
*end2;
int m,
stringlen,
setlen;
stringlen = VARSIZE_ANY_EXHDR(string);
setlen = VARSIZE_ANY_EXHDR(set);
if (stringlen <= 0 || setlen <= 0)
return string;
m = stringlen;
ptr = VARDATA_ANY(string);
end = ptr + stringlen - 1;
ptr2start = VARDATA_ANY(set);
end2 = ptr2start + setlen - 1;
if (doltrim)
{
while (m > 0)
{
ptr2 = ptr2start;
while (ptr2 <= end2)
{
if (*ptr == *ptr2)
break;
++ptr2;
}
if (ptr2 > end2)
break;
ptr++;
m--;
}
}
if (dortrim)
{
while (m > 0)
{
ptr2 = ptr2start;
while (ptr2 <= end2)
{
if (*end == *ptr2)
break;
++ptr2;
}
if (ptr2 > end2)
break;
end--;
m--;
}
}
ret = (bytea *) palloc(VARHDRSZ + m);
SET_VARSIZE(ret, VARHDRSZ + m);
memcpy(VARDATA(ret), ptr, m);
return ret;
}
/********************************************************************
*
* byteatrim
*
* Syntax:
*
* bytea byteatrim(bytea string, bytea set)
*
* Purpose:
*
* Returns string with characters removed from the front and back
* up to the first character not in set.
*
* Cloned from btrim and modified as required.
********************************************************************/
Datum
byteatrim(PG_FUNCTION_ARGS)
{
bytea *string = PG_GETARG_BYTEA_PP(0);
bytea *set = PG_GETARG_BYTEA_PP(1);
bytea *ret;
ret = dobyteatrim(string, set, true, true);
PG_RETURN_BYTEA_P(ret);
}
/********************************************************************
*
* bytealtrim
*
* Syntax:
*
* bytea bytealtrim(bytea string, bytea set)
*
* Purpose:
*
* Returns string with initial characters removed up to the first
* character not in set.
*
********************************************************************/
Datum
bytealtrim(PG_FUNCTION_ARGS)
{
bytea *string = PG_GETARG_BYTEA_PP(0);
bytea *set = PG_GETARG_BYTEA_PP(1);
bytea *ret;
ret = dobyteatrim(string, set, true, false);
PG_RETURN_BYTEA_P(ret);
}
/********************************************************************
*
* byteartrim
*
* Syntax:
*
* bytea byteartrim(bytea string, bytea set)
*
* Purpose:
*
* Returns string with final characters removed after the last
* character not in set.
*
********************************************************************/
Datum
byteartrim(PG_FUNCTION_ARGS)
{
bytea *string = PG_GETARG_BYTEA_PP(0);
bytea *set = PG_GETARG_BYTEA_PP(1);
bytea *ret;
ret = dobyteatrim(string, set, false, true);
PG_RETURN_BYTEA_P(ret);
}
/********************************************************************
*
* ltrim
*
* Syntax:
*
* text ltrim(text string, text set)
*
* Purpose:
*
* Returns string with initial characters removed up to the first
* character not in set.
*
********************************************************************/
Datum
ltrim(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
text *set = PG_GETARG_TEXT_PP(1);
text *ret;
ret = dotrim(VARDATA_ANY(string), VARSIZE_ANY_EXHDR(string),
VARDATA_ANY(set), VARSIZE_ANY_EXHDR(set),
true, false);
PG_RETURN_TEXT_P(ret);
}
/********************************************************************
*
* ltrim1 --- ltrim with set fixed as ' '
*
********************************************************************/
Datum
ltrim1(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
text *ret;
ret = dotrim(VARDATA_ANY(string), VARSIZE_ANY_EXHDR(string),
" ", 1,
true, false);
PG_RETURN_TEXT_P(ret);
}
/********************************************************************
*
* rtrim
*
* Syntax:
*
* text rtrim(text string, text set)
*
* Purpose:
*
* Returns string with final characters removed after the last
* character not in set.
*
********************************************************************/
Datum
rtrim(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
text *set = PG_GETARG_TEXT_PP(1);
text *ret;
ret = dotrim(VARDATA_ANY(string), VARSIZE_ANY_EXHDR(string),
VARDATA_ANY(set), VARSIZE_ANY_EXHDR(set),
false, true);
PG_RETURN_TEXT_P(ret);
}
/********************************************************************
*
* rtrim1 --- rtrim with set fixed as ' '
*
********************************************************************/
Datum
rtrim1(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
text *ret;
ret = dotrim(VARDATA_ANY(string), VARSIZE_ANY_EXHDR(string),
" ", 1,
false, true);
PG_RETURN_TEXT_P(ret);
}
/********************************************************************
*
* translate
*
* Syntax:
*
* text translate(text string, text from, text to)
*
* Purpose:
*
* Returns string after replacing all occurrences of characters in from
* with the corresponding character in to. If from is longer than to,
* occurrences of the extra characters in from are deleted.
* Improved by Edwin Ramirez <ramirez@doc.mssm.edu>.
*
********************************************************************/
Datum
translate(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
text *from = PG_GETARG_TEXT_PP(1);
text *to = PG_GETARG_TEXT_PP(2);
text *result;
char *from_ptr,
*to_ptr;
char *source,
*target;
int m,
fromlen,
tolen,
retlen,
i;
int bytelen;
int len;
int source_len;
int from_index;
m = VARSIZE_ANY_EXHDR(string);
if (m <= 0)
PG_RETURN_TEXT_P(string);
source = VARDATA_ANY(string);
fromlen = VARSIZE_ANY_EXHDR(from);
from_ptr = VARDATA_ANY(from);
tolen = VARSIZE_ANY_EXHDR(to);
to_ptr = VARDATA_ANY(to);
/*
* The worst-case expansion is to substitute a max-length character for a
* single-byte character at each position of the string.
*/
if (unlikely(pg_mul_s32_overflow(pg_database_encoding_max_length(), m,
&bytelen)) ||
unlikely(pg_add_s32_overflow(bytelen, VARHDRSZ, &bytelen)) ||
unlikely(!AllocSizeIsValid(bytelen)))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested length too large")));
result = (text *) palloc(bytelen);
target = VARDATA(result);
retlen = 0;
while (m > 0)
{
source_len = pg_mblen(source);
from_index = 0;
for (i = 0; i < fromlen; i += len)
{
len = pg_mblen(&from_ptr[i]);
if (len == source_len &&
memcmp(source, &from_ptr[i], len) == 0)
break;
from_index++;
}
if (i < fromlen)
{
/* substitute */
char *p = to_ptr;
for (i = 0; i < from_index; i++)
{
p += pg_mblen(p);
if (p >= (to_ptr + tolen))
break;
}
if (p < (to_ptr + tolen))
{
len = pg_mblen(p);
memcpy(target, p, len);
target += len;
retlen += len;
}
}
else
{
/* no match, so copy */
memcpy(target, source, source_len);
target += source_len;
retlen += source_len;
}
source += source_len;
m -= source_len;
}
SET_VARSIZE(result, retlen + VARHDRSZ);
/*
* The function result is probably much bigger than needed, if we're using
* a multibyte encoding, but it's not worth reallocating it; the result
* probably won't live long anyway.
*/
PG_RETURN_TEXT_P(result);
}
/********************************************************************
*
* ascii
*
* Syntax:
*
* int ascii(text string)
*
* Purpose:
*
* Returns the decimal representation of the first character from
* string.
* If the string is empty we return 0.
* If the database encoding is UTF8, we return the Unicode codepoint.
* If the database encoding is any other multi-byte encoding, we
* return the value of the first byte if it is an ASCII character
* (range 1 .. 127), or raise an error.
* For all other encodings we return the value of the first byte,
* (range 1..255).
*
********************************************************************/
Datum
ascii(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
int encoding = GetDatabaseEncoding();
unsigned char *data;
if (VARSIZE_ANY_EXHDR(string) <= 0)
PG_RETURN_INT32(0);
data = (unsigned char *) VARDATA_ANY(string);
if (encoding == PG_UTF8 && *data > 127)
{
/* return the code point for Unicode */
int result = 0,
tbytes = 0,
i;
if (*data >= 0xF0)
{
result = *data & 0x07;
tbytes = 3;
}
else if (*data >= 0xE0)
{
result = *data & 0x0F;
tbytes = 2;
}
else
{
Assert(*data > 0xC0);
result = *data & 0x1f;
tbytes = 1;
}
Assert(tbytes > 0);
for (i = 1; i <= tbytes; i++)
{
Assert((data[i] & 0xC0) == 0x80);
result = (result << 6) + (data[i] & 0x3f);
}
PG_RETURN_INT32(result);
}
else
{
if (pg_encoding_max_length(encoding) > 1 && *data > 127)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested character too large")));
PG_RETURN_INT32((int32) *data);
}
}
/********************************************************************
*
* chr
*
* Syntax:
*
* text chr(int val)
*
* Purpose:
*
* Returns the character having the binary equivalent to val.
*
* For UTF8 we treat the argument as a Unicode code point.
* For other multi-byte encodings we raise an error for arguments
* outside the strict ASCII range (1..127).
*
* It's important that we don't ever return a value that is not valid
* in the database encoding, so that this doesn't become a way for
* invalid data to enter the database.
*
********************************************************************/
Datum
chr (PG_FUNCTION_ARGS)
{
int32 arg = PG_GETARG_INT32(0);
uint32 cvalue;
text *result;
int encoding = GetDatabaseEncoding();
/*
* Error out on arguments that make no sense or that we can't validly
* represent in the encoding.
*/
if (arg < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("character number must be positive")));
else if (arg == 0)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("null character not permitted")));
cvalue = arg;
if (encoding == PG_UTF8 && cvalue > 127)
{
/* for Unicode we treat the argument as a code point */
int bytes;
unsigned char *wch;
/*
* We only allow valid Unicode code points; per RFC3629 that stops at
* U+10FFFF, even though 4-byte UTF8 sequences can hold values up to
* U+1FFFFF.
*/
if (cvalue > 0x0010ffff)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested character too large for encoding: %u",
cvalue)));
if (cvalue > 0xffff)
bytes = 4;
else if (cvalue > 0x07ff)
bytes = 3;
else
bytes = 2;
result = (text *) palloc(VARHDRSZ + bytes);
SET_VARSIZE(result, VARHDRSZ + bytes);
wch = (unsigned char *) VARDATA(result);
if (bytes == 2)
{
wch[0] = 0xC0 | ((cvalue >> 6) & 0x1F);
wch[1] = 0x80 | (cvalue & 0x3F);
}
else if (bytes == 3)
{
wch[0] = 0xE0 | ((cvalue >> 12) & 0x0F);
wch[1] = 0x80 | ((cvalue >> 6) & 0x3F);
wch[2] = 0x80 | (cvalue & 0x3F);
}
else
{
wch[0] = 0xF0 | ((cvalue >> 18) & 0x07);
wch[1] = 0x80 | ((cvalue >> 12) & 0x3F);
wch[2] = 0x80 | ((cvalue >> 6) & 0x3F);
wch[3] = 0x80 | (cvalue & 0x3F);
}
/*
* The preceding range check isn't sufficient, because UTF8 excludes
* Unicode "surrogate pair" codes. Make sure what we created is valid
* UTF8.
*/
if (!pg_utf8_islegal(wch, bytes))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested character not valid for encoding: %u",
cvalue)));
}
else
{
bool is_mb;
is_mb = pg_encoding_max_length(encoding) > 1;
if ((is_mb && (cvalue > 127)) || (!is_mb && (cvalue > 255)))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested character too large for encoding: %u",
cvalue)));
result = (text *) palloc(VARHDRSZ + 1);
SET_VARSIZE(result, VARHDRSZ + 1);
*VARDATA(result) = (char) cvalue;
}
PG_RETURN_TEXT_P(result);
}
/********************************************************************
*
* repeat
*
* Syntax:
*
* text repeat(text string, int val)
*
* Purpose:
*
* Repeat string by val.
*
********************************************************************/
Datum
repeat(PG_FUNCTION_ARGS)
{
text *string = PG_GETARG_TEXT_PP(0);
int32 count = PG_GETARG_INT32(1);
text *result;
int slen,
tlen;
int i;
char *cp,
*sp;
if (count < 0)
count = 0;
slen = VARSIZE_ANY_EXHDR(string);
if (unlikely(pg_mul_s32_overflow(count, slen, &tlen)) ||
unlikely(pg_add_s32_overflow(tlen, VARHDRSZ, &tlen)) ||
unlikely(!AllocSizeIsValid(tlen)))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("requested length too large")));
result = (text *) palloc(tlen);
SET_VARSIZE(result, tlen);
cp = VARDATA(result);
sp = VARDATA_ANY(string);
for (i = 0; i < count; i++)
{
memcpy(cp, sp, slen);
cp += slen;
CHECK_FOR_INTERRUPTS();
}
PG_RETURN_TEXT_P(result);
}
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